Open Source, $0.00
Nmap ("Network Mapper") is a free and open source (license) utility for network exploration or security ... firewalls, routers, and other obstacles. This includes many port scanning mechanisms (both TCP & UDP), OS detection, ... networks of literally hundreds of thousands of machines. Portable: Most operating systems are supported, including Linux, Microsoft Windows, FreeBSD, OpenBSD, Solaris, IRIX, Mac OS X, HP-UX, NetBSD, Sun ...
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